dragoeco on "Random post according to localization"

Hi all. I'm searching for a way to get a ling to redirect to a radom post according the language selected by the visitor. I've created my own button but I just need a link who can do that. Maybe someting like:
mysite.com/?display-post&orderby=rand
or maybe a modification to function.php file like here
I have 2 languages and about 10 categories on each languages.
If anyone have an idea, he'll makes my day :) Thanks